"Bloody Hell" is the cry from Detective Chief Inspector Jon Valberg of the Police Service of Northern Ireland but it morphs into the Norse of his father's tongue as "Blodigit Helvette". Set in today's City of Derry, this powerful narrative may evoke older deeper fears of a blood-soaked devil that would not look out of place in the saga of Beowulf. It is a modern morality tale that hides on the shelves of any crime section. But this book is quite unique, like the writer, Desmond Doherty, who is an acclaimed lawyer within Northern Ireland and internationally. His experience of human rights qualifies him to reflect insightfully on human wrongs with a humanity that invites the reader to see the fragile mental state of V, the investigating officer, while suggesting a plea in mitigation for the multiple murderer. It is no co-incidence that the acronym of the spree killer's name is GOD. Such is the breath-taking pace of the unfolding storyline that I was unable to stop myself completing it on the same day. The historic City of Derry becomes a powerful backdrop especially when the author uses the paradox of the bridges that cross the Foyle River to become the instrument of division. In a year that celebrates much that is positive in the city's culture, Desmond Doherty has the courage to locate this terrifying novel unapologetically in Derry, showing the author's great confidence in the people of his native town that they could savour the sour with the sweet. I ended this book wanting more from this author and I understand we may not have to wait too long for more in the Valberg series. He is one of those rare lawyers who have been successful in transferring his courtroom skills as an advocate to the printed page. Like a good Stilton cheese, riddled with decay, it may be an acquired taste for some but once enjoyed you will demand more.